JPH0718420B2 - Scroll compressor - Google Patents

Description

The present invention relates to a scroll type compressor that compresses a compressed gas in a compression chamber that is a compression space of a fixed scroll and an orbiting scroll, In particular, the present invention relates to improvements in the mounting structure of a discharge guide mechanism for extracting and guiding the compressed gas compressed in the compression chamber and a release mechanism for lowering the compression capacity as necessary.

(Prior Art) Compared with a reciprocating compressor or a rotary compressor that is usually used, there is little compression leakage during compression, high efficiency, small torque fluctuation, low vibration and low noise, suction Scroll type compressors are attracting attention because they have high reliability because they do not require valves and do not have problems such as fluid loss and damage due to valves.

The main part of this type of compressor is conventionally as shown in FIG. Reference numeral 1 is a closed case, and a frame 2 is provided in the closed case 1. A scroll compressor unit 3 is arranged on the upper side of the frame 2, and an electric motor unit 4 is arranged on the lower side thereof, and a crankshaft 5 is rotatably inserted in the substantially central portion of the frame 2.

The scroll compressor unit 3 includes a fixed scroll 8 in which a spiral wrap 7 is integrally hung on the lower surface of an upper mirror plate 6 and a revolving scroll 11 in which a spiral wrap 10 is integrally erected on the upper surface of a lower mirror plate 9. Consists of. Both the wraps 7 and 10 of the fixed scroll 8 and the orbiting scroll 11 are combined in a state of being superposed on each other. On the other hand, a discharge hole 12 is provided substantially in the center of the upper mirror plate 6 of the fixed scroll 8, and a discharge cover 13 is fixedly mounted on the upper mirror plate 6. A discharge pipe 14 that communicates with an external device such as a condenser (not shown) penetrates through the closed case 1, and an open end of the discharge pipe 14 communicates with the internal space of the discharge cover 13.

The lower end plate 9 of the orbiting scroll 11 is supported by the frame 2, and the lower surface boss part of the lower end plate 9 is fitted into the eccentric part 5a of the crankshaft 5. The eccentric portion 5a is formed on the upper end of the crankshaft 5 and has an axis eccentric from the axis by a predetermined dimension. Reference numeral 15 is a suction pipe connected to a part of the peripheral wall of the closed case 1 and communicates with an external device such as an accumulator. Reference numeral 16 is a Rayris tube constituting a release mechanism, one end of which penetrates the upper end plate 6 of the fixed scroll 8 and its open end faces between the wraps 7. Further, the release pipe 16 penetrates the discharge chamber 13a in the discharge cover 13, projects from the discharge cover 13 and penetrates the closed case 1, and communicates with the middle portion of the suction pipe 15. Such a release pipe 16 is provided with a valve mechanism (not shown) that can be opened and closed as needed in the middle thereof. As the release mechanism, other than this, for example, a release chamber is provided adjacent to the discharge cover 13 or in the discharge chamber 13a, and a release pipe penetrating the upper end plate 6 through the release chamber and the discharge chamber 13a is provided. It will be.

The electric motor unit 4 includes a rotor 17 that is fitted to the crankshaft 5 at a lower portion of the frame 2 and a stator 18 that is fixed to the outer peripheral surface of the rotor 17 with a small gap.

In the scroll compressor configured as described above, the crankshaft 5 is rotationally driven by energizing the electric motor portion 4, and the orbiting scroll 11 orbits. Along with this, the compression chamber S, which is a substantially crescent-shaped compression space formed between the wrap 10 of the orbiting scroll 11 and the wrap 7 of the fixed scroll 8, continuously changes. The compressed gas, for example, the refrigerant gas is once discharged from the external device, for example, the accumulator, into the closed case 1 through the suction pipe 15. That is, it is a so-called low-pressure compressor.
This refrigerant gas is sucked into the compression chamber S via a suction passage (not shown) provided in the frame 2, and is gradually compressed in a spiral shape toward the center with the orbiting motion of the orbiting scroll 11, and is converted into high pressure gas. It And the discharge hole 12
Is discharged from the discharge pipe 13 to the discharge chamber 13a in the discharge cover 13, where noise and discharge pressure pulsation are regulated, and the discharge pipe 14 is guided to an external device such as a condenser.

By the way, in the scroll type compressor configured in this way, like the rotary compressor normally used,
Activate the release mechanism if necessary. That is, this is based on the reduction of the refrigerant circulation amount, and can be performed by opening the cylinder in a normal rotary compressor and the release pipe 16 in such a scroll compressor. Then, a part of the compressed gas being compressed from the compression chamber S is returned to the suction side of the compressor, merged with the compressed gas on the suction side, and thereafter, a regular compression stroke is performed. In this way, by bypassing a part of the gas in the middle of compression, the refrigerating capacity is reduced and the compression work is reduced at the same time, so that it is possible to reduce the power consumption without lowering the so-called COP. Specifically, the release port is opened, for example, when the cooling load is light and the desired temperature is reached.

(Problems to be Solved by the Invention) In such a low-pressure scroll compressor, the high-pressure gas compressed in the compression chamber S is once discharged to the discharge chamber 13a in the discharge cover 13 to muffle noise and discharge pressure. Reducing the pulsation is as described above, and in order to ensure the desired effect, the capacity of the discharge cover 13 must be increased.

However, the outer diameter of the sealed case 1 is set with the required capacity of the scroll compressor section 3 and the electric motor section 4 and the minimum necessary margin. Further, the area of the upper end plate 6 of the fixed scroll 8 to which the discharge cover 13 is attached and fixed is also suppressed to the minimum necessary diameter. For these reasons, the height and diameter of the discharge cover 13 are inevitably set, and the capacity of the discharge chamber 13a formed inside the discharge cover 13 cannot be made sufficiently large. However, the effect of reducing discharge pressure pulsation was insufficient. Moreover, the release pipe 16 has a fixed scroll 8 at the opening at one end.
The penetrating upper end plate 6, the middle part thereof penetrates the discharge chamber 13a and protrudes from the discharge cover 13, and further penetrates the above-mentioned sealed case 1 to be fixedly attached to each. For this reason, the release pipe 16 requires welding work such as silver brazing and mounting work for the three constituent parts, and the number of man-hours for mounting the parts in this part increases, and there are problems such as poor assembly.

The present invention has been made in view of the above circumstances, and it is possible to increase the capacity of the discharge chamber that receives high-pressure gas without changing the dimensions of the sealing cover and the discharge cover, and to sufficiently reduce noise and discharge pressure pulsation. It is an object of the present invention to provide a scroll type compressor that can obtain an effect and can improve the workability and the assembling property of a release mechanism.

[Structure of Invention]

(Means for Solving the Problems) That is, in the present invention, a low-pressure scroll type compressor that once sucks a compressed gas into a hermetically sealed case and guides it to a compression chamber formed between a fixed scroll and an orbiting scroll, The compressed gas compressed in the compression chamber is discharged into the discharge cover attached to the end plate constituting the fixed scroll, and the compressed gas is compressed in the compression chamber in order to reduce the compression capacity as needed. In the one provided with a release mechanism that is once taken out from the compression chamber and guided to the suction side, a discharge concave portion and a release concave portion are provided on the end plate surface constituting the fixed scroll, the opening surface of the discharge concave portion is opened, and the release concave portion is opened. A partition plate for closing the opening surface of the recess for use is provided between the end plate and the discharge cover, and penetrates the peripheral wall of the end plate to connect the release mechanism to the release recess. It is a scroll type compressor characterized in that

(Function) With this configuration, the discharge chamber capacity is the original discharge cover plus the discharge recess newly formed on the end plate of the fixed scroll, and the dimensions of the hermetic cover and discharge cover are increased. Without any modification, the discharge chamber capacity is increased over the conventional one. Moreover, the mounting process of the release mechanism becomes easier than the conventional one.

(Embodiment) Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 4. The shape structure of the upper end plate 6 constituting the fixed scroll 8 and the discharge guide mechanism 20 for the upper end plate 6 are described below.
Other components except for the connection structure of the release mechanism 21 may be exactly the same as those described above with reference to FIG. 5, so that the same drawing is applied and a new description is omitted. A discharge recess 22 and a release recess 23 are provided on the upper surface side of the upper end plate 6. That is, as shown in FIGS. 2 and 3, a rib 6a is left along the substantial center line of the upper end plate 6 and an annular portion 6b is left along the peripheral end portion thereof, and the discharge concave portion is provided therebetween. twenty two
And the release recess 23 opens in a substantially bisected state. A partition plate 25 is mounted on the upper surface of the upper end plate 6 and is interposed between the partition plate 25 and the discharge cover 13. Partition plate 25 above
As shown in FIG. 4, has an opening 25a having the same area only in a portion facing the ejection recess 22. Therefore, the partition plate 25 opens the opening surface of the discharge recess 22 and closes the opening surface of the release recess 23 while being interposed between the upper end plate 6 and the discharge cover 13. In other words, the discharge cover
The inside of 13 and the discharge recess 22 communicate with each other through the opening 25a of the partition plate 25, and the discharge chamber 26 is formed by these. On the other hand, the bottom of the discharge recess 22 and the release recess 23
A discharge hole 27 and a release hole 28 are formed on the bottom surface of the upper end plate 6 over the surface on the wrap 7 side. That is, the wraps 7 and 10 of the fixed scroll 8 and the orbiting scroll 11
The compression chamber S and the discharge recess 22 and the release recess 23 formed between them communicate with each other through the discharge hole 27 and the release hole 28. Further, the discharge recess 22 and the release recess 23 are provided with a discharge guide hole 29 and a release guide hole 30, respectively. The discharge guide hole 29 and the release guide hole 30 are opened from the outer peripheral side of the discharge recesses 22 and the release recesses 23 to the peripheral surface of the upper end plate 6. At each open end, discharge pipe 31 and release pipe
One end of 32 is connected. The discharge pipe 31 and the release pipe 32 respectively penetrate the closed case 1 and are connected to predetermined portions. That is, the discharge guide mechanism 20 including the discharge guide hole 29 and the discharge pipe 31 and the release mechanism 21 including the release guide hole 30 and the release pipe 32 respectively penetrate through the peripheral wall of the upper end plate 6 and are connected to each other. To be done. In this way, especially the release mechanism 21 is easier to mount and fix than the conventional one. Although not shown,
The release mechanism 21 is provided with a valve mechanism similar to the conventional one, and can be opened / closed as necessary.

Therefore, the discharge guide mechanism 20 and the release mechanism
21 has exactly the same function as the conventional one, but the capacity of the discharge chamber 26 that receives the compressed high-pressure gas all together is the sum of the capacity of the discharge cover 13 and the discharge recess 22 of the upper end plate 6.
It will increase more than before. Therefore, the muffling effect when receiving high-pressure gas is improved and the discharge pressure pulsation is reduced. Furthermore, if necessary, the compressed gas being compressed in the compression chamber S is taken out from the compression chamber S to the release recess 23 via the release hole 28, and is guided to the release pipe 32 via the release guide hole 30 to be compressed. The machine part 3 joins with the compressed gas to be sucked. Therefore, the compressed gas in the middle of compression in the compression chamber S is once taken out and guided to the suction side of the compressor unit 3, so that the compression capacity of this compressor can be reduced.

Although the discharge guide mechanism 20 is connected to the peripheral wall of the upper end plate 8 of the fixed scroll 6 in the above embodiment, the discharge guide mechanism 20 is not limited to this and may be connected to the discharge cover 13, for example.

〔The invention's effect〕

As described above, according to the present invention, it is possible to increase the capacity of the discharge chamber that receives the high pressure gas compressed in the compression chamber without changing the shape and structure of the components such as the sealing cover and the discharge cover. Therefore, it is possible to obtain noise reduction and a sufficient reduction effect of discharge pressure pulsation. Further, in particular, the release mechanism can be easily machined, mounted and assembled to improve workability, which contributes to cost reduction.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention. FIG. 1 is a vertical sectional view of a main part of a scroll type compressor, FIG. 2 is a vertical sectional view of a part thereof, and FIG. 3 is a fixed scroll. A plan view, FIG. 4 is a plan view of a partition plate, and FIG. 5 is a vertical cross-sectional view of a main part of a scroll compressor showing a conventional example of the present invention. 1 ... Sealed case, 8 ... Fixed scroll, 11 ... Orbiting scroll, S ... Compression chamber, 6 ... (Upper part of fixed scroll) End plate, 13 ... Discharge cover, 21 ... Release mechanism,
22 …… Discharge recess, 23 …… Release recess, 25 …… Partition plate.

Claims (1)

[Claims] 1. A low-pressure scroll type compressor for temporarily sucking a compressed gas into a hermetically sealed case and guiding it to a compression chamber formed between a fixed scroll and an orbiting scroll, which is attached to an end plate constituting the fixed scroll. In order to discharge the compressed gas compressed in the compression chamber into the discharge cover, and to lower the compression capacity as necessary, the compressed gas being compressed in the compression chamber is once taken out from the compression chamber and is then sent to the suction side. In a device provided with a leading release mechanism, a discharge concave portion and a release concave portion are provided on a mirror plate surface constituting the fixed scroll, an opening surface of the discharge concave portion is opened, and an open surface of the release concave portion is closed. A scroll compressor, wherein a partition plate is interposed between the end plate and the discharge cover, the partition plate penetrates the peripheral wall of the end plate, and the release mechanism is connected to the release recess.